Work vehicle
A work vehicle includes a fixed hood covering a rear area of an engine compartment housing an engine and an engine accessory, a swing axis extending through the rear area of the engine compartment in a transverse direction of the vehicle, and a swing hood swinging around the swing axis between a closed position and an open position. The swing hood tucks the fixed hood inside the swing hood and thus covers the fixed hood in the open position, and covers a front area and a middle area of the engine compartment and overlaps with a front end portion of the fixed hood in the closed position.
Latest KUBOTA CORPORATION Patents:
The present application claims priority under 35 U.S.C. §119 of Japanese Application No. 2012-155391, filed on Jul. 11, 2012, which is herein expressly incorporated by reference in its entirety.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates to a work vehicle having an engine and engine accessories behind a driver seat.
2. Description of Related Art
Japanese Patent Laid-Open Publication No. 2009-240214 (paragraphs [0020] to [0036] and FIGS. 1 and 2; corresponding foreign application: US2009/0241498A1) discloses a mid-mount mower as a work vehicle, in which a driver seat is provided in a central portion of a vehicle frame supported on the ground by front and rear wheels and an engine and engine accessories are provided behind the driver seat. In this mid-mount mower, the engine and engine accessories, which are covered by a hood, are disposed in a space to the rear of the driver seat. The hood has a divided structure composed of two portions divided in a vertical direction (direction of height above the ground). The hood includes a rear cover connected to the vehicle frame and an upper cover pivoted at an upper rear portion of the rear cover. The rear space covered by the hood is divided into two spaces by a separation wall that includes a front wall and a bottom wall, the front wall extending along a front surface of the engine, the bottom wall extending along a bottom surface. The upper cover completely covers above the rear cover in a closed posture, and completely opens the space inside the upper cover in an open posture, in which the upper cover is swung so as to largely project rearward of the vehicle. The hood structure, meanwhile, requires a large space in the rear of the vehicle to open the upper cover.
Japanese Patent Laid-Open Publication No. 2008-074293 (paragraphs [0012] to [0015] and FIGS. 1 and 3; corresponding foreign application: U.S. Pat. No. 7,527,298B1) and Japanese Patent Laid-Open Publication No. 2006-341743 (paragraphs [0018] to [0026] and FIGS. 1 and 4) disclose a front mount mower as a work vehicle, in which an engine and engine accessories are provided behind a driver seat. In this front mount mower, an engine compartment covered by a hood includes the engine which is mounted in the rear of a left-right pair of main frames and the engine accessories, such as a radiator for cooling the engine, provided in front of the engine in the vehicle. Dustproof nets are provided at a front end and two front side surfaces of the hood to serve as engine cooling air inlets. The engine cooling air inlets are open on both outer lateral sides and a top side of the vehicle. A rotating cooling fan driven by the engine blows air. Thus, air outside the hood is suctioned through the engine cooling air inlets to the vicinity of the radiator in the hood, and then engine cooling air is generated and supplied to the radiator. To this end, an anteroposterior length of the vehicle is lengthened to increase an amount of cooling air flowing in from the engine cooling air inlets in the two side surfaces, and thus large spaces are formed on two sides of the radiator. A hood in Japanese Patent Laid-Open Publication No. 2006-341743 has a dustproof net formed of a perforated metal in a portion that covers the cooling fan and the radiator.
In order to meet stringent exhaust gas regulations, Japanese Patent Laid-Open Publication No. 2012-26326 (paragraphs [0012] to [0018] and FIGS. 1 and 2) discloses a front mount mower as a work vehicle, in which a diesel particulate filter (DPF) is mounted as an engine accessory. The DPF is a large engine accessory and has a high operating temperature. Thus, the DPF requires a sufficient space and a cooling environment. Accordingly, a hood, which is swung around a pivot in a rear of the vehicle to cover a large engine compartment, increases in size and weight, thus requiring a large force to open and swing the hood.
In view of the above, there is demand for a work vehicle that has an improved hood to cover an engine and engine accessories provided behind a driver seat.
SUMMARY OF THE INVENTIONAn advantage of the present invention is to provide a work vehicle having an engine compartment supported by a vehicle frame behind a driver seat, the engine compartment housing an engine and an engine accessory and including a front area, a middle area, and a rear area. The work vehicle includes a fixed hood covering the rear area; a swing axis extending through the rear area in a transverse direction of the vehicle; and a swing hood swinging around the swing axis between a closed position and an open position. The swing hood tucks the fixed hood inside the swing hood and thus covers the fixed hood in the open position, and covers the front area and middle area and overlaps with a front end portion of the fixed hood in the closed position. Specifically, the fixed hood and the swing hood form a swing-type nesting structure. In the open position, the fixed hood is tucked into and covered by the swing hood.
Unless otherwise defined in particular in the present specification, the term “front” in a positional relationship denotes one running direction of a vehicle and the term “rear” denotes the other direction. Thus, an anteroposterior direction of the vehicle represents a longitudinal direction of the vehicle and a transverse direction of the vehicle represents a width direction of the vehicle.
In this configuration, the hood is divided into the fixed hood and the swing hood, each of which is thus more lightweight than a regular hood. In particular, a reduction in weight of the swing hood facilitates a swing operation of the swing hood. Furthermore, the fixed hood and the swing hood can be assembled individually. This facilitates not only transportation of each hood for hood assembly, but also assembly work. In addition, the swing hood is opened rearward around the rear swing axis, and then the fixed hood is tucked into and covered by the swing hood tucks in the open posture. This reduces a projection amount of the swing hood rearward of the work vehicle in the open position.
In the operation above, a swing range of the swing hood is from 90° to 120°. In an embodiment in which the swing hood is in a flat posture in the closed position and is in an upright posture in the open position, minimum openness is secured for the engine compartment and rearward projection of the swing hood is minimized in the open posture. This allows maintenance of the engine compartment even in a narrow space.
In an embodiment in which a DPF, which increases in temperature, is disposed in the rear area of the engine compartment, a heated DPF is covered by the fixed hood even when the swing hood is open, thus reducing a possibility that the heated DPF may be touched inadvertently. In addition, a flow of air from front to rear reaches the heated DPF at the end of the flow, thus eliminating a possibility that the flow of air to cool other devices may be heated by the DPF.
In one preferred embodiment to achieve the features of the hood structure according to the present invention, the fixed hood has a boxed shape covering the rear area and including a rear panel and a left-right pair of side panels, and the swing hood in the open position externally surrounds the rear panel and the left-right pair of side panels of the fixed hood.
To efficiently cool the engine compartment with the flow of air from front to rear, an engine is preferably disposed in the middle area of the engine compartment and a cooling fan and a radiator are preferably disposed in the front area separated from the middle area by a shroud extending in the transverse direction of the vehicle. To efficiently take air into the engine compartment from the front, in one preferred embodiment of the present invention, the swing hood has an external air intake in an area facing the front area of the swing hood in the open position.
In one preferred embodiment of the present invention, the swing hood has a bisected structure. This simplifies assembly of the swing hood and allows selection of materials for each divided element.
The present invention is further described in the detailed description which follows, with reference to the noted plurality of drawings by way of non-limiting examples of exemplary embodiments of the present invention, in which like reference numerals represent similar parts throughout the several views of the drawings, and wherein:
The particulars shown herein are by way of example and for purposes of illustrative discussion of the embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the present invention. In this regard, no attempt made to show structural details of the present invention in more detail than is necessary for the fundamental understanding of the present invention, the description is taken with the drawings making apparent to those skilled in the art how the forms of the present invention may be embodied in practice.
One embodiment of the present invention is described with reference to a front mount mower as an example of a work vehicle according to the present invention. With reference to
In the front of the vehicle frame 10, a handle post 16 stands to support a steering wheel 17. A driver seat 13 is provided behind the handle post 16 and slightly behind the front wheels 11. A ROPS 14 stands immediately behind the driver seat 13. With reference to
As most clearly shown in
In the middle area 42, the engine 6 is disposed and the cylindrical air cleaner 63 is disposed above the engine 6. The air cleaner 63 is provided above the engine 6 closer to a side from a central portion in the transverse direction of the vehicle. In the rear area 43 in the rear of the vehicle, the DPF 66 is disposed horizontally, preceding an exhaust pipe 65. A cylindrical exhaust end portion 67 including an exhaust outlet 67a that emits exhaust air from the DPF 66 is also disposed below the DPF 66 in the rear area 43.
A hood 8 that covers the engine compartment 4 from above is disposed above the rear frame 10b. The hood 8 is bisected in the anteroposterior direction of the vehicle into a fixed hood 8A covering the rear area and a swing hood 8B. With reference to a combination of
With reference to
The swing hood 8B in the closed position surrounds the side panels 86 and the rear panel 87 of the fixed hood 8A with clearances therebetween. In the swing hood 8B in the closed position, as shown in
With reference to
In the closed position of the swing hood 8B, as shown in
An area in a front end portion of the swing hood 8B in contact with and supported by the floor plate 15 is provided with a shock absorber 89, as shown in
The cooling fan 62 connected to an output axis of the engine 6 is rotated and driven to take external air into the front area 41 of the engine compartment 4, and then blow the air, which passes through the radiator 60, to the middle area 42 covered by the swing hood 8B and the rear area 43 covered by the fixed hood 8A.
With reference to
In the present embodiment, an electronic control unit (hereinafter referred to as ECU) 90 is disposed in the extended area 41b defined by one of the projections (52 on the right) provided on the two sides of the shroud 5. Specifically, a bracket 58 is fixed to the vertical plate 52a of the projection 52 and the rectangular parallelepiped ECU 90 is fixed to a central portion of the bracket 58. With reference to
Furthermore, a through-hole 52c elongated in the vertical direction is provided in a central portion of the horizontal plate 52b of the projection 52. Through the through-hole 52c, an intake duct 64 extending from the air cleaner 63 extends from the middle area 42 into the front area of the engine compartment 4. Specifically, an air inlet 64a provided in a front end portion of the intake duct 64 is positioned in the extended area 41b, which is in the front area 41 of the engine compartment 4. Thus, the air cleaner 63 suctions fresh air from the front area 41. Alternatively, the ECU 90, the coupler 92 for electric components, and the air inlet 64a of the intake duct 64 may be disposed separately in the extended areas 41a and 41b on the two sides. In a case where the projection 52 is provided only on one side of the shroud 5, the ECU 90, the coupler 92, and the air inlet 64a are disposed in the extended area 41b.
With reference to
In the present embodiment, a protection plate 59 is provided to completely cover a surface of the ECU 90 that faces the external air intake 85. The protection plate 59 protects the ECU 90 from rain water or washing liquid entering through the external air intake 85. Furthermore, the protection plate 59 can also serve as a heat sink by bringing the protection plate 59 into contact with a housing of the ECU 90 so as to transfer heat or by providing fins on an outer surface of the protection plate 59.
With reference to
The exhaust gas which is cleaned through the DPF 66 passes through the downstream exhaust pipe 65b extending from the DPF 66 and is emitted rearward of the vehicle from the exhaust outlet 67a of the exhaust end portion 67. Immediately after flowing into a start section of the downstream exhaust pipe 65b, the exhaust gas has a very high temperature of approximately 600° C. To reduce the temperature of the exhaust gas emitted from the exhaust outlet 67a to a temperature of approximately 270° C., the downstream exhaust pipe 65b has structural features described below to ensure a sufficient cooling section.
The start section of the downstream exhaust pipe 65b extends forward and upward from a side end area of the DPF 66. A first middle section, which extends from the start section, of the downstream exhaust pipe 65b extends in the longitudinal direction of the DPF 66 in front of the DPF 66. The first middle section, which is positioned above the engine 6, can effectively receive cooling air flowing through the middle area 42 of the engine compartment 4. With reference to
With reference to
The swing hood 8B can be integrally formed by welding or plating; however, handling thereof is difficult in assembly or maintenance due to an increase in weight. Thus, a divided structure is preferably employed, as shown in
With reference to
Other Embodiments
(1) The present invention limits the layout of the fixed hood 8A, the swing hood 8B, and the driver seat 13 such that the swing hood 8B is positioned between the driver seat 13 and the fixed hood 8A in the anteroposterior direction of the vehicle. Thus, a work vehicle having a fixed hood 8a positioned at a front end portion of a vehicle frame 10 in the anteroposterior direction is included in the present invention.
(2) In the embodiment above, the present invention is applied to a front mount mower. The present invention may also be applied to other types of mowers, including a mid-mount mower. Of course, the present invention is applicable to a vehicle other than a mower, such as a work vehicle having an engine compartment 4 in a rear of a vehicle.
(3) The hood 8 may be composed of a resin, a steel, or a hybrid of a resin and a steel.
(4) In the embodiment above, the swing hood 8B is pivoted by the pivot bracket 80, which is supported by the rear frame 10b. Alternatively, the swing hood 8B may be pivoted by the fixed hood 8A, provided that the fixed hood 8A has sufficient strength.
(5) In the embodiment above, the swing hood 8B has a swing range exceeding 90° from the horizontal flat posture. The swing hood 8B is held in the open position at the end of the swing by its own weight and the stopper mechanism. Instead of this configuration, the swing hood 8B may be held in the open position by a damper. In this case, where the weight of the swing hood 8B is not applied, the swing range of the swing hood 8B is 90° or less. Of course, a damper may be used as a swing assisting component in the embodiment above.
(6) The electronic control unit 90 is provided in the right outer area extended by the projections 51 and 52 in the front area 41 of the engine compartment 4. Of course, the electronic control unit 90 may be provided in the left outer area. In a case where there are a plurality of electronic control units 90, they may be separately provided in both areas. Furthermore, a device other than the electronic control unit 90 that needs to be cooled may be disposed in the areas.
It is noted that the foregoing examples have been provided merely for the purpose of explanation and are in no way to be construed as limiting of the present invention. While the present invention has been described with reference to exemplary embodiments, it is understood that the words which have been used herein are words of description and illustration, rather than words of limitation. Changes may be made, within the purview of the appended claims, as presently stated and as amended, without departing from the scope and spirit of the present invention in its aspects. Although the present invention has been described herein with reference to particular structures, materials and embodiments, the present invention is not intended to be limited to the particulars disclosed herein; rather, the present invention extends to all functionally equivalent structures, methods and uses, such as are within the scope of the appended claims.
The present invention is not limited to the above described embodiments, and various variations and modifications may be possible without departing from the scope of the present invention.
Claims
1. A work vehicle comprising:
- an engine compartment supported by a vehicle frame and being located behind a driver seat;
- the engine compartment comprising a front area, a middle area, and a rear area and being sized and configured to contain therein an engine and at least one engine accessory;
- a fixed hood structured and arranged to cover the rear area;
- a swing hood movable about a swing axis between at least a closed position and an open position;
- the swing axis extending through the rear area along a direction transverse to a longitudinal direction of the vehicle,
- wherein, in the open position, the swing hood covers and at least partially contains therein the fixed hood,
- wherein, in the closed position, the swing hood covers the front area and middle area and includes a portion that overlaps a front end portion of the fixed hood, and
- wherein the swing hood overlaps more of lateral side portions of the fixed hood in the open position than in the closed position.
2. The work vehicle of claim 1, wherein the portion that overlaps the front end portion of the fixed hood overlies the front end portion of the fixed hood in the closed position.
3. The work vehicle of claim 1, wherein, in the open position, the swing hood covers and contains therein all or nearly all of the fixed hood.
4. The work vehicle of claim 1, wherein the swing hood is arranged in a generally horizontal posture in the closed position and is arranged in a generally vertical or upright posture in the open position.
5. The work vehicle of claim 4, wherein the swing hood can pivot about the swing axis between the closed and open position between an angular range.
6. The work vehicle of claim 5, wherein the angular range is between approximately 90 degrees and approximately 120 degrees.
7. The work vehicle of claim 1, further comprising a DPF disposed in the rear area.
8. The work vehicle of claim 1, wherein the fixed hood comprises a generally boxed shape covering that includes a rear panel portion and a left-right pair of side panels, and wherein, in the open position, side panel portions of the swing hood overlie or surround the rear panel and the left-right pair of side panels of the fixed hood.
9. The work vehicle of claim 1, further comprising:
- an engine disposed in the middle area;
- a cooling fan and radiator disposed in the front area;
- a shroud arranged between and separating the middle area from the front area and being oriented along a direction generally parallel to the transverse direction.
10. The work vehicle of claim 1, wherein the swing hood comprises at least one external air intake located at a front area of the swing hood.
11. The work vehicle of claim 1, wherein the swing hood comprises two main sections.
12. A work vehicle comprising:
- an engine compartment supported by a vehicle frame;
- the engine compartment comprising a front area, a middle area, and a rear area and being sized and configured to contain therein an engine and at least one engine accessory;
- a fixed hood;
- a swing hood structured and arranged to pivot about around a swing axis at least between a closed position and an open position while the fixed hood remains stationary;
- the swing axis extending along a direction transverse to a longitudinal direction of the vehicle,
- wherein, in the open position, the swing hood covers and at least partially contains therein the fixed hood,
- wherein, in the closed position, the swing hood substantially covers at least one of the front, middle and rear areas of the engine compartment, and
- wherein the swing axis is located closer to a bottom of the fixed hood than to a top of the fixed hood.
13. The working vehicle of claim 12, wherein:
- in the closed position, the swing hood covers the rear and middle areas and includes a portion that overlaps or overlies a portion of the fixed hood; and
- the fixed hood covers the front area.
14. The working vehicle of claim 12, wherein, in the closed position, the swing hood substantially covers two of the front, middle and rear areas of the engine compartment.
15. A work vehicle comprising:
- an engine compartment supported by a vehicle frame and being located behind a driver seat;
- the engine compartment comprising a front area, a middle area, and a rear area and being sized and configured to contain therein an engine and at least one engine accessory;
- a fixed hood structured and arranged to cover the rear area;
- a swing hood movable about a swing axis between at least a closed position and an open position while the fixed hood remains stationary;
- the swing axis extending through the rear area along a direction transverse to a longitudinal direction of the vehicle,
- wherein, in the open position, the swing hood covers and at least partially contains therein the fixed hood,
- wherein, in the closed position, the swing hood covers the front area and middle area and includes a portion that overlaps a front end portion of the fixed hood,
- wherein the swing hood overlaps more of the fixed hood in the open position than in the closed position, and
- wherein the swing axis is located closer to a bottom of the fixed hood than to a top of the fixed hood.
16. The work vehicle of claim 15, wherein, in the open position, the swing hood covers and contains therein all or nearly all of the fixed hood and wherein the swing hood is arranged in a generally horizontal posture in the closed position and is arranged in a generally vertical or upright posture in the open position.
7096987 | August 29, 2006 | Moen et al. |
20130074410 | March 28, 2013 | Berkeland |
2006-341743 | December 2006 | JP |
2008-074293 | April 2009 | JP |
2009-240214 | October 2009 | JP |
2012-026326 | February 2012 | JP |
Type: Grant
Filed: Mar 1, 2013
Date of Patent: Jun 2, 2015
Patent Publication Number: 20140014429
Assignee: KUBOTA CORPORATION (Osaka)
Inventors: Kazuaki Nogami (Osaka), Hiroyuki Tada (Osaka), Yoshiyuki Esaki (Osaka), Kazutomo Miyaguchi (Osaka), Eiji Sato (Osaka), Akira Minoura (Osaka), Hironori Tsuchihashi (Wakayama), Osami Fujiwara (Osaka), Seiya Yoshida (Osaka)
Primary Examiner: Jeffrey J Restifo
Application Number: 13/782,445